[scikit-learn] Issue regarding Feature Union

[Guillaume Lemaître]

you can get the pipeline (with optimized hyperparameters) using
grid_search.best_estimator_. Applying the code of Chris on this estimator
will work.

On Thu, 6 May 2021 at 13:45, mitali katoch <mitalikatoch at gmail.com> wrote:

> Hi Chris,
> I forgot to mention that this pipeline I have used within the GridSearchCV.
> I have done what you suggested early but didn't work, it said:
> 'GridSearchCV' object has no attribute 'named_steps'.
>
> I somehow figured out now
> Thanks for your help though.
>
> Best regards,
> Mitali Katoch
>
> On Thu, May 6, 2021, 12:47 Chris Aridas <chris at aridas.eu> wrote:
>
>> Hi,
>>
>> Assuming that you have trained your pipeline, the following piece of code should work.
>>
>>
>> pipeline.named_steps["feature_sel"].transform(X)
>>
>> Best,
>> Chris
>>
>> On Thu, May 6, 2021 at 12:52 PM mitali katoch <mitalikatoch at gmail.com>
>> wrote:
>>
>>>   Dear Scikit team,
>>>
>>> I am working with FeatureUnion in the pipeline and best parameters are
>>> as follows:
>>> Pipeline(steps=[('feature_sel',
>>>                  FeatureUnion(transformer_list= [ ('selectk',
>>> SelectKBest(k=500)),
>>>                                                 ('sel_fromModel',
>>>
>>>  SelectFromModel(estimator=LogisticRegression(C=1,
>>>
>>>                       penalty='l1',
>>>
>>>                       solver='liblinear'),
>>>
>>>  max_features=100))]
>>> )),
>>>                 ('sampler', SMOTE(k_neighbors=2, random_state=10)),
>>>                 ('model', SVC(random_state=10))]
>>> )
>>>
>>> I would like to extract those SelectKBest(k=500) and max_features=100
>>> from the pipeline.
>>>
>>> Could you please confirm whether it is possible to do it, If yes, could
>>> you share the solution, I would highly appreciate that.
>>>
>>> Thanks in advance.
>>>
>>> Best Regards,
>>> Mitali Katoch
>>>
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-- 
Guillaume Lemaitre
Scikit-learn @ Inria Foundation
https://glemaitre.github.io/
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